The U.S. Government agency that manages airport security shifts its strategic emphasis from stopping weapons to finding people.

It’s a potential $4 billion market for private industry, based on what the Transportation Security Administration, or TSA, currently spends on aviation security.

“Businesses that are good at data analysis, behavior-pattern recognition, big data handling, data-visualization — all ought to come out ahead,” said Stewart Baker, who headed the Department of Homeland Security from 2005 through 2009.

“We could also see an increase in demand for identification tools, such as biometric and facial-recognition scanners,” he said in an interview.

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